This chapter traces how theism was developed by leading 19th and 20th century figures (Schleiermacher, Hegel, Kierkegaard, Nietzsche, Rahner, and Tillich) responding to Kant’s Copernican revolution in philosophy. Part one deals with the ontological nature of subjectivity itself and what it reveals about the conditions of the possibility of a subject’s relation to the Absolute. Part two explores the role of subjectivity and interiority in the individual’s relation to God, and part three takes a look at the theme of the “unhappy consciousness,” how its development led to important attacks on theism, and the resources available to theology in countering these attacks.